Oracle uses asynchronous I/O even for the client . Without libaio-devel , you’ll get ORA-12547: TNS lost contact during testing.
The Oracle Universal Installer (OUI) will launch. You will see four installation options:
The database listener is not running or the port is blocked. Verify on the server: lsnrctl status . Check firewall rules – open port 1521 (default). install oracle client 12c
Installs the tools required to run applications, omitting management utilities.
Or, after installation, you can use the standalone deinstall command located in $ORACLE_HOME/deinstall . Oracle uses asynchronous I/O even for the client
Cause: The network client cannot locate or read your tnsnames.ora entry.
: The specific folder where the 12c client binary files will reside (e.g., C:\app\client\YourUsername\product\12.2.0\client_1 ). omitting management utilities. Or
tnsping ORCLPDB